With the development of the economy, the people's requirements for long range communication have increased, and DMR radios have gradually begun to be used in public fields such as taxi dispatching, security, property management services, construction sites, hotels and restaurants. So how many kilometers can the longest call distance of a DMR radio reach?

However, when supported by system software base stations (such as repeaters), the talking distance of digital walkie-talkies can reach more than ten kilometers or even tens of kilometers. Even under ideal conditions without obstacles, for every doubling of distance, the signal output power will drop to a quarter, that is, a 6dB loss. In comparison, typical DMR radios only have frequencies ranging from 100 to 400 MHz. We know that the lower the frequency, the wider its propagation area. The data signal frequency of these DMR radios is very different from that of mobile phones.

In general，the digital error correction technology of DMR radios can transmit accurate voice and data in a wider range without any loss. Noise is caused by factors such as anti-static, by reducing the signal strength, analog signals tend to be distorted, and static noise is generated at the same time. DMR radios get rid of what they think is wrong, which helps users get better reception in noisy environments.